Anxiety
From Tardis Wiki, the free Doctor Who reference
Choosing to leave her behind in 22nd century England, the First Doctor told Susan Foreman to go forward without regrets, tears or anxieties. (TV: The Dalek Invasion of Earth)
Albert Arnold told the Second Doctor that he looked anxious as the latter waited for the Great Intelligence to absorb him. (TV: The Web of Fear)
A Mark VI combat mechanical detected anxiety in Graham O'Brien's voice. (PROSE: The Secret in Vault 13)